repl: fix buffer clearing after npm command

lib/repl.js

@@ -285,7 +285,7 @@ function REPLServer(prompt, stream, eval, useGlobal, ignoreUndefined) {
           self.outputStream.write('npm should be run outside of the ' +
                                   'node repl, in your normal shell.\n' +
                                   '(Press Control-D to exit.)\n');
-          self.bufferedCmd = '';
+          self.bufferedCommand = '';
           self.displayPrompt();
           return;
         }